SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function minus (alias x) (children 1)
     ExpressionList (children 2)
      Function toDate (children 1)
       ExpressionList (children 1)
        Literal \'2001-10-01\'
      Function toDate (children 1)
       ExpressionList (children 1)
        Literal \'2001-09-28\'
    Function toTypeName (children 1)
     ExpressionList (children 1)
      Identifier x
